CVE-2026-18787: GL.iNet AX1800 RPC Endpoint oui-rpc.lua remove_rule command injection

A vulnerability was identified in GL.iNet AX1800 up to 4.8.3. The affected element is the function removerule of the file /usr/share/gl-ngx/oui-rpc.lua of the component RPC Endpoint. The manipulation of the argument args.id leads to command injection. The attack is possible to be carried out remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure.